Ready-To-Install Means Adding a Transom Jamb

Sash Only (Front) and Sash with Optional Jamb (Rear) Whereas the transom sash is the carrier for the glass (just like a sash on an ordinary window), the jamb is the perimeter piece that connects the sash to the wall.

The jamb surrounds the transom sash and holds it in place. Once the sash is in place, the jamb is mulled (that is, attached) to the door jamb below or attached directly to the studs (on the side) and header (above) the opening. This can be done with trim nails or screws. See Basic Installation.

At Transoms Direct we have two Ready-to-Install options for you to consider:

  • Jamb Only. A perimeter jamb, made to complement the sash you selected, and ready-to-install.
  • Operable Unit with Jamb. Jamb fitted with hinges and a mechanism allowing the sash to open and close.

More About Jambs

Why Don't You Just Install a Jamb on Every Transom You Sell?

The simple answer...

We do not know the thickness of your wall, and the jamb has to be made to match the thickness of the wall.

So, we decided to make the jamb a separate option, made-to-order, to accommodate your particular situation.

Make or Buy a Jamb?

If we know your wall thickness, we can include a jamb for for each transom sash when you order. As an alternative, you can have a carpenter build the transom jamb onsite.

Understand that the carpenter will need common materials and tools onsite, and they may charge you for these materials and the jamb's construction. That is why many builders and carpenters whom we serve have us build the jamb -- they find it more cost effective than building it themselves.

For your convenience, we have comprehensive instructions on how to build a jamb and how the jamb secures the sash in the wall. See Basic Installation.

More About Operable Transoms

Model AC-2 with Operable Transom Option Dating back to the 1800's, the original purpose for a transom window was to provide ventilation. Early transoms were almost always operable -- that is, they could be opened and closed. These hinged windows were often located above larger windows or doors. When opened, the transom allowed ventilation while the door or window below remained locked or closed.

Like so many things, style evolved from function. Over time, transoms became so commonplace in finer homes that they were appreciated for their beauty and elegance as well as ventilation. Then came along air conditioning in the 1920s and 30s.

Just like window shutters that are now more aesthetic than functional, the advent of air conditioning prompted people to begin deleting the operating mechanisms from transoms. Most transoms installed today come in an always closed, fixed-window format. You can order this configuration from us as a Ready-to-Install Jamb.

But whether it be style or function, operable transom windows are making a comeback! After receiving many requests, we began building dozens of these operable transoms in different styles. Most any of our rectangular or square transom models can now be made operable as an option. Such an option will be shown on the transom model's Order Page.


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Kind Words From Our Customers

"Thank you for the beautiful windows and packing them so snugly! They're just gorgeous." -- J.W. Lafayette, CO